| 摘要 |
A hydraulic control system for au automatic transmission, including an oil pump drivingly connected to an engine, regulator means (90) for regulating an applying-pressure to a forward clutch, a hydraulic control valve (71) outputting a first signal pressure indicative of an optionally settable oil pressure to the regulator means, a control unit controlling the hydraulic control valve (71), a first oil passage (41) communicating the oil pump and the regulator means (90), a second oil passage (93) communicating the regulator means (90) and the forward clutch, a third oil passage (42) feeding a clamping pressure for a belt of a CVT, and means (14) for detecting an oil pressure in the third oil passage. The regulator means (90) receives the signal pressure and controls the communication between the first and second oil passages (41,93) . The control unit is programmed to determine an oil pressure value at which transmittable torque capacities of the forward clutch and the belt are equal to each other, and output a command to the hydraulic control valve (71) so as to produce a second signal pressure for communicating the first and second oil passages (41,93) at a full-open state when the detected oil pressure in the third oil passage (42) is not more than the determined value upon an engine restart operation after idling stop.
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